| Abstrakt: |
This study establishes the structure of the Tisserfine basin, located in the eastern Moroccan High Atlas, through an integrated interpretation of geophysical data. Several types of data were integrated in this work: a gravity map, 243 vertical electrical soundings (VES), a seismic reflection profile; logs of 10 boreholes, geological maps, and field structural measurements. The gravity map shows a succession of lows and highs-oriented WSW-ENE, paralleling the regional structures (synclines and anticlines). Gravity lows are correlated with Triassic evaporites (mostly clays) that were uplifted into high elevation areas (anticlines). Gravity highs correspond to the accumulation of limestones, sandstones, and marls in synclines. A multiscale analysis of gravimetric lineaments shows the main faults bordering the anticlines and synclines. The seismic reflection profile indicates that the Tisserfine syncline is affected by several faults; the Mesozoic formations in the axis of the syncline exceed a depth of 3000 m, and that the anticlines (corresponding to topographic highs) present very high dips (69–87°). The results of 2D resistivity models are in good agreement with geological data and reveal several faults. The models exhibit a conductive layer (marls, 800 m-thick), with intercalations of highly resistive levels inferred to be sandstones. The basement is characterized by very high resistivity values, matching limestones or dolostones. The hydrogeological units consist of two unconfined and three confined aquifers. The piezometric outline shows that the groundwater flows converge towards the Tisserfine wadi with a direction flow to the east. The presence of water throughout the year in several places at the Tisserfine and Zouzfana wadis (e.g. Dfilia (Aghlal) springs) represents the drainage of an unconfined aquifer. [ABSTRACT FROM AUTHOR] |
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